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Weather April in Knoxville, United States of America Visitors to Knoxville during the month of April should plan on bringing a raincoat since it will be raining some days. The amount of rain is high with an average of 83mm (3.3in). The average maximum temperature lies around 16.0Â°C (60.8Â°F). This month is known as a chilly month.
The average temperature in April is a delightful 22Â°C, which is two degrees higher than it was in March and three degrees below what it will be in May. Nights are very comfortable this time of year, averaging 16Â°C, which is ideal for evening walks, for example. The afternoons already get quite warm, the mercury reaching an average high of 28Â°C. Both these average low and high temperatures increase by about three degrees in the course of the month.